..well, looks like you've done your homework..sounds like a good plan...as far as cheap ferts available at walmart..may i suggest alaskan fish emulsion..about 6 bucks i think..and they have rootone as well
..the only thing i can suggest would be using a larger pot than 1 gallon once your ready to flower....and remember this bigest problems most newbies have....overwatering...and ph problems..anyway..good luck and have fun